Want to move everything over to either a 75 or 90 gallon. All my equipment, plants, and fish will move.

Couple of things I know I will change:
Use Ecocomplete (or something I can afford). Don't like the stratum but paid too much money to ditch it so it'll be left for the goldfish that are moving into the 45 gal.
Use Finnex planted plus 48" lights instead of T5
Move up from a 5 lb CO2 tank to 10 lb.

Here is my question: how many Finnex planted plus lights do I need? I think I need two banks regardless if it's a 75 or 90 gallon tank. Any other suggestions on my set up before I whip out the credit card and go for it?

I have a 45 gallon planted tank with Milwaukee regulator, needle valve, soleneoid and bubble counter. I now know Milwaukee does not have the best reputation - but that's what I have. I bought a GLA inline diffuser and attached it to the outake of my Eheim Pro3 canister filter. I increased CO2 pressure to 45 psi and adjusted for 1-2 bps on the bubble counter. I used soapy water to check for leaks at the brass check valve and connection to the inline diffuser. I can get 1-2 bps but I do not seem to have any CO2 moving through the diffuser. GLA says I probably have a leak in my bubble counter and I am losing pressure and not able to push CO2 through the diffuser. Does this sound right?

Is the inline diffuser suppose to be filled with water? Or is it suppose to have no water and only air? I have read that some have it filled with air when operating correctly, but when the solenoid turns off, the diffuser fills with water.